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Warrants - Issued November 11, 2014 Monte Carlo (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair value assumptions and methodology for assets and liabilities    
Number of warrants (in shares) 563,998 913,441
Warrants Issued November 11, 2014, Liability    
Fair value assumptions and methodology for assets and liabilities    
Number of warrants (in shares) 16,000 16,000
CDTi stock price (in dollars per share) $ 1.73 $ 4.70
Strike price (in dollars per share) $ 6.10 $ 6.10
Expected volatility 95.20% 95.50%
Risk-free interest rate 0.80% 1.50%
Expected life in years 3 years 4 months 24 days 3 years 10 months 24 days